To fully use the resources of the existent networks

operators with GSM networks should construct 3G networks based on sharing station address. In this paper

we first analyze the availability of sharing station address according to the requirement of networks coverage. Then we analyze the interference between the GSM and WCDMA systems

and give the disturb distance for engineering requirement between the antennas of the two systems. Last we supply some suggestions on reconstruction the sharing equipments in the station address

such as machinery room and tower for antennas.